mirror of
https://github.com/gorhill/uMatrix.git
synced 2024-05-04 04:13:55 +12:00
264 lines
8.8 KiB
JavaScript
264 lines
8.8 KiB
JavaScript
/*******************************************************************************
|
|
|
|
uMatrix - a browser extension to block requests.
|
|
Copyright (C) 2016-2017 The uBlock Origin authors
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see {http://www.gnu.org/licenses/}.
|
|
|
|
Home: https://github.com/gorhill/uBlock
|
|
*/
|
|
|
|
/* global indexedDB, IDBDatabase */
|
|
|
|
'use strict';
|
|
|
|
/******************************************************************************/
|
|
|
|
// The code below has been originally manually imported from:
|
|
// Commit: https://github.com/nikrolls/uBlock-Edge/commit/d1538ea9bea89d507219d3219592382eee306134
|
|
// Commit date: 29 October 2016
|
|
// Commit author: https://github.com/nikrolls
|
|
// Commit message: "Implement cacheStorage using IndexedDB"
|
|
|
|
// The original imported code has been subsequently modified as it was not
|
|
// compatible with Firefox.
|
|
// (a Promise thing, see https://github.com/dfahlander/Dexie.js/issues/317)
|
|
// Furthermore, code to migrate from browser.storage.local to vAPI.cacheStorage
|
|
// has been added, for seamless migration of cache-related entries into
|
|
// indexedDB.
|
|
|
|
// Imported from uBlock Origin project.
|
|
|
|
vAPI.cacheStorage = (function() {
|
|
const STORAGE_NAME = 'uMatrixCacheStorage';
|
|
var db;
|
|
var pending = [];
|
|
|
|
// prime the db so that it's ready asap for next access.
|
|
getDb(noopfn);
|
|
|
|
return { get, set, remove, clear, getBytesInUse };
|
|
|
|
function get(input, callback) {
|
|
if ( typeof callback !== 'function' ) { return; }
|
|
if ( input === null ) {
|
|
return getAllFromDb(callback);
|
|
}
|
|
var toRead, output = {};
|
|
if ( typeof input === 'string' ) {
|
|
toRead = [ input ];
|
|
} else if ( Array.isArray(input) ) {
|
|
toRead = input;
|
|
} else /* if ( typeof input === 'object' ) */ {
|
|
toRead = Object.keys(input);
|
|
output = input;
|
|
}
|
|
return getFromDb(toRead, output, callback);
|
|
}
|
|
|
|
function set(input, callback) {
|
|
putToDb(input, callback);
|
|
}
|
|
|
|
function remove(key, callback) {
|
|
deleteFromDb(key, callback);
|
|
}
|
|
|
|
function clear(callback) {
|
|
clearDb(callback);
|
|
}
|
|
|
|
function getBytesInUse(keys, callback) {
|
|
// TODO: implement this
|
|
callback(0);
|
|
}
|
|
|
|
function genericErrorHandler(error) {
|
|
console.error('[%s]', STORAGE_NAME, error);
|
|
}
|
|
|
|
function noopfn() {
|
|
}
|
|
|
|
function processPendings() {
|
|
var cb;
|
|
while ( (cb = pending.shift()) ) {
|
|
cb(db);
|
|
}
|
|
}
|
|
|
|
function getDb(callback) {
|
|
if ( pending === undefined ) {
|
|
return callback();
|
|
}
|
|
if ( pending.length !== 0 ) {
|
|
return pending.push(callback);
|
|
}
|
|
if ( db instanceof IDBDatabase ) {
|
|
return callback(db);
|
|
}
|
|
pending.push(callback);
|
|
if ( pending.length !== 1 ) { return; }
|
|
// https://github.com/gorhill/uBlock/issues/3156
|
|
// I have observed that no event was fired in Tor Browser 7.0.7 +
|
|
// medium security level after the request to open the database was
|
|
// created. When this occurs, I have also observed that the `error`
|
|
// property was already set, so this means uBO can detect here whether
|
|
// the database can be opened successfully. A try-catch block is
|
|
// necessary when reading the `error` property because we are not
|
|
// allowed to read this propery outside of event handlers in newer
|
|
// implementation of IDBRequest (my understanding).
|
|
var req;
|
|
try {
|
|
req = indexedDB.open(STORAGE_NAME, 1);
|
|
if ( req.error ) {
|
|
console.log(req.error);
|
|
req = undefined;
|
|
}
|
|
} catch(ex) {
|
|
}
|
|
if ( req === undefined ) {
|
|
processPendings();
|
|
pending = undefined;
|
|
return;
|
|
}
|
|
req.onupgradeneeded = function(ev) {
|
|
req = undefined;
|
|
db = ev.target.result;
|
|
db.onerror = db.onabort = genericErrorHandler;
|
|
var table = db.createObjectStore(STORAGE_NAME, { keyPath: 'key' });
|
|
table.createIndex('value', 'value', { unique: false });
|
|
};
|
|
req.onsuccess = function(ev) {
|
|
req = undefined;
|
|
db = ev.target.result;
|
|
db.onerror = db.onabort = genericErrorHandler;
|
|
processPendings();
|
|
};
|
|
req.onerror = req.onblocked = function() {
|
|
req = undefined;
|
|
console.log(this.error);
|
|
processPendings();
|
|
pending = undefined;
|
|
};
|
|
}
|
|
|
|
function getFromDb(keys, store, callback) {
|
|
if ( typeof callback !== 'function' ) { return; }
|
|
if ( keys.length === 0 ) { return callback(store); }
|
|
var gotOne = function() {
|
|
if ( typeof this.result === 'object' ) {
|
|
store[this.result.key] = this.result.value;
|
|
}
|
|
};
|
|
getDb(function(db) {
|
|
if ( !db ) { return callback(); }
|
|
var transaction = db.transaction(STORAGE_NAME);
|
|
transaction.oncomplete =
|
|
transaction.onerror =
|
|
transaction.onabort = function() {
|
|
return callback(store);
|
|
};
|
|
var table = transaction.objectStore(STORAGE_NAME);
|
|
for ( var key of keys ) {
|
|
var req = table.get(key);
|
|
req.onsuccess = gotOne;
|
|
req.onerror = noopfn;
|
|
req = undefined;
|
|
}
|
|
});
|
|
}
|
|
|
|
function getAllFromDb(callback) {
|
|
if ( typeof callback !== 'function' ) {
|
|
callback = noopfn;
|
|
}
|
|
getDb(function(db) {
|
|
if ( !db ) { return callback(); }
|
|
var output = {};
|
|
var transaction = db.transaction(STORAGE_NAME);
|
|
transaction.oncomplete =
|
|
transaction.onerror =
|
|
transaction.onabort = function() {
|
|
callback(output);
|
|
};
|
|
var table = transaction.objectStore(STORAGE_NAME),
|
|
req = table.openCursor();
|
|
req.onsuccess = function(ev) {
|
|
var cursor = ev.target.result;
|
|
if ( !cursor ) { return; }
|
|
output[cursor.key] = cursor.value;
|
|
cursor.continue();
|
|
};
|
|
});
|
|
}
|
|
|
|
function putToDb(input, callback) {
|
|
if ( typeof callback !== 'function' ) {
|
|
callback = noopfn;
|
|
}
|
|
var keys = Object.keys(input);
|
|
if ( keys.length === 0 ) { return callback(); }
|
|
getDb(function(db) {
|
|
if ( !db ) { return callback(); }
|
|
var transaction = db.transaction(STORAGE_NAME, 'readwrite');
|
|
transaction.oncomplete =
|
|
transaction.onerror =
|
|
transaction.onabort = callback;
|
|
var table = transaction.objectStore(STORAGE_NAME);
|
|
for ( var key of keys ) {
|
|
var entry = {};
|
|
entry.key = key;
|
|
entry.value = input[key];
|
|
table.put(entry);
|
|
entry = undefined;
|
|
}
|
|
});
|
|
}
|
|
|
|
function deleteFromDb(input, callback) {
|
|
if ( typeof callback !== 'function' ) {
|
|
callback = noopfn;
|
|
}
|
|
var keys = Array.isArray(input) ? input.slice() : [ input ];
|
|
if ( keys.length === 0 ) { return callback(); }
|
|
getDb(function(db) {
|
|
if ( !db ) { return callback(); }
|
|
var transaction = db.transaction(STORAGE_NAME, 'readwrite');
|
|
transaction.oncomplete =
|
|
transaction.onerror =
|
|
transaction.onabort = callback;
|
|
var table = transaction.objectStore(STORAGE_NAME);
|
|
for ( var key of keys ) {
|
|
table.delete(key);
|
|
}
|
|
});
|
|
}
|
|
|
|
function clearDb(callback) {
|
|
if ( typeof callback !== 'function' ) {
|
|
callback = noopfn;
|
|
}
|
|
getDb(function(db) {
|
|
if ( !db ) { return callback(); }
|
|
var req = db.transaction(STORAGE_NAME, 'readwrite')
|
|
.objectStore(STORAGE_NAME)
|
|
.clear();
|
|
req.onsuccess = req.onerror = callback;
|
|
});
|
|
}
|
|
}());
|
|
|
|
/******************************************************************************/
|